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Table 2 Comparison of the cross-sectional area of the AM tibial tunnel at the four cutting levels between immediate postoperative and postoperative 1 year CT scans

From: Paradoxical tunnel enlargement after ACL reconstruction with hamstring autografts when using β-TCP containing interference screws for tibial aperture fixation- prospectively comparative study

Cutting level

 

Cross sectional area (mm2)

 
 

Group

Immediate postop.

1YR

Difference

P

Joint line

1

41.5 ± 6.6

54.6 ± 11.3

13.2 (31.7%)

< 0.001

 

2

42.0 ± 9.1

57.3 ± 12.1

15.4 (36.6%)

< 0.001

* P

   

0.523

 

Mid-tunnel

1

41.8 ± 7.2

58.6 ± 11.6

16.8 (40.1%)

< 0.001

 

2

41.9 ± 8.7

70.0 ± 19.5

28.1 (66.9%)

< 0.001

* P

   

0.028

 

Mid-screw

1

61.0 ± 10.5

77.6 ± 13.3

16.6 (27.2%)

< 0.001

 

2

63.3 ± 9.8

73.9 ± 14.2

10.6 (16.8%)

< 0.001

* P

   

0.024

 

Outlet

1

62.0 ± 10.6

69.2 ± 15.1

7.3 (11.7%)

< 0.001

 

2

61.6 ± 11.3

68.4 ± 14.4

6.8 (11.0%)

< 0.001

* P

   

0.833

 
  1. 1YR; postoperative 1 year
  2. *Comparison of the increments in cross-sectional area 1 year after surgery between the two groups at the each cutting level
  3. Comparison of the cross-sectional area between immediate postoperative and postoperative 1 year CT scans
  4. *Values of P < 0.05 are displayed in bold